/*
 * Copyright (C)  Tony Green, LitePal Framework Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.litepal.parser;


import ohos.org.xml.sax.Attributes;
import ohos.org.xml.sax.SAXException;
import ohos.org.xml.sax.helpers.DefaultHandler;

/**
 * This is the content handler for analysis the litepal.xml file by SAXParser,
 * and temporarily the only correct way to generate LitePalAttr model with
 * values.
 * 
 * @author Tony Green
 * @since 1.0
 */
public class LitePalContentHandler extends DefaultHandler {

    /**
     * Store the parsed value of litepal.xml.
     */
    private LitePalAttr litePalAttr;

    /**
     * Characters in the characters tag. Decide to not use this method
     * temporarily. Use value attribute instead.
     *
     * @param ch char
     * @param start start index
     * @param length length
     *
     * @throws SAXException SAXException
     */
    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {

    }

    /**
     * End of the document. Doing nothing temporarily.
     *
     * @throws SAXException SAXException
     */
    @Override
    public void endDocument() throws SAXException {
    }

    /**
     * End of the element. Doing nothing temporarily.
     *
     * @param uri uri
     * @param localName localName
     * @param qName qName
     *
     * @throws SAXException SAXException
     */
    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
    }

    /**
     * Start of the document. Generate a LitePalAttr model at the same time.
     *
     * @throws SAXException SAXException
     */
    @Override
    public void startDocument() throws SAXException {
        litePalAttr = LitePalAttr.getInstance();
        litePalAttr.getClassNames().clear();
    }

    /**
     * Start analysis the litepal.xml file. Set all the parsed value into the
     * LitePalAttr model.
     *
     * @param uri uri
     * @param localName localName
     * @param qName qName
     * @param attributes attributes
     *
     * @throws SAXException SAXException
     */
    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes)
            throws SAXException {
        if (LitePalParser.NODE_DB_NAME.equalsIgnoreCase(localName)) {
            for (int i = 0; i < attributes.getLength(); i++) {
                if (LitePalParser.ATTR_VALUE.equalsIgnoreCase(attributes.getLocalName(i))) {
                    litePalAttr.setDbName(attributes.getValue(i).trim());
                }
            }
        } else if (LitePalParser.NODE_VERSION.equalsIgnoreCase(localName)) {
            for (int i = 0; i < attributes.getLength(); i++) {
                if (LitePalParser.ATTR_VALUE.equalsIgnoreCase(attributes.getLocalName(i))) {
                    litePalAttr.setVersion(Integer.parseInt(attributes.getValue(i).trim()));
                }
            }
        } else if (LitePalParser.NODE_MAPPING.equalsIgnoreCase(localName)) {
            for (int i = 0; i < attributes.getLength(); i++) {
                if (LitePalParser.ATTR_CLASS.equalsIgnoreCase(attributes.getLocalName(i))) {
                    litePalAttr.addClassName(attributes.getValue(i).trim());
                }
            }
        } else if (LitePalParser.NODE_CASES.equalsIgnoreCase(localName)) {
            for (int i = 0; i < attributes.getLength(); i++) {
                if (LitePalParser.ATTR_VALUE.equalsIgnoreCase(attributes.getLocalName(i))) {
                    litePalAttr.setCases(attributes.getValue(i).trim());
                }
            }
        } else if (LitePalParser.NODE_STORAGE.equalsIgnoreCase(localName)) {
            for (int i = 0; i < attributes.getLength(); i++) {
                if (LitePalParser.ATTR_VALUE.equalsIgnoreCase(attributes.getLocalName(i))) {
                    litePalAttr.setStorage(attributes.getValue(i).trim());
                }
            }
        }
    }

}

